manufacturer c8 is GigaDevice and device 4013 is GD25Q40, which is a 4Mbit=512KByte device

manufacturer ef is Winbond (ex Nexcom) and device 4016 is W25Q32, which is a 32Mbit=4MByte device

ESP-WROOM-02 By Espressif Systems

CE of ESP-WROOM-02

FCC of ESP-WROOM-02

ESP-01

Note: Some batches of this module ship with LED Current limiting resistors of the wrong value (47Ohm vs 4.7KOhm). This usually results in the power LED vanishing in a puff of smoke.

ESP-02

ESP-03

Pin

Name

Alternate Functions

Notes

1

GND

(Pin 1 is in the corner close to the crystal and away from antenna)

2

NC

3

UTXD

SPICS1, GPIO1, CLK_RTC

Typically used as serial uart0 TX

4

URXD

I2SO_DATA, GPIO3, CLK_XTAL

Typically used as serial uart0 RX

5

GPIO16

XPD_DCDC, RTC_GPIO0, EXT_WAKEUP, DEEPSLEEP

Connected to XPD_DCDC ESP pin, can also be connected to ESP EXT_RSTB (reset) pin by closing jumper near pin 8; Reset pin is active low and has an internal weak pull-up; Connecting jumper is required to wake-up ESP from deep-sleep: RTC produces pulse on XPD_DCDC pin that needs to be fed into EXT_RSTB pin

6

CH_PD

Power-down: low input powers down chip, high powers up; tie high for normal operation or module will not function

7

ANT

Wifi Antenna, do not connect

8

VCC

3.3V input (pin 8 is between antenna and ESP chip)

9

GPIO14

MTMS, I2SI_WS, SP_CLK

10

GPIO12

MTDI, I2SI_DATA, MISO

11

GPIO13

MTCK, I2SI_BCK, MOSI

12

GPIO15

MTDO, I2SO_BCK, SP_CS

At boot: must be low to enter flash or normal boot (high enters special boot modes)

13

GPIO2

I2SO_WS, U1TXD, U0TXD

At boot: must be high to enter flash or normal boot (low enters special boot modes); Typically is used as uart1 TX for debug logging

ESP-12S

ESP-13

ESP-14

Backside of the ESP8266-14 module.
The ESP8266-14 module has pins and connections on three sides of the board

ESP8266-14 module with metal shield removed. Underneath the shield there is a 20-pin QFPN chip with the marking 'S033', which according to the STM8S003 datasheet is the proper device marking.

WT8266-S1 By Wireless-Tag

CE of WT8266-S1

FCC of WT8266-S1

Modules Family

Modules shown here together with an external aerial, a large, cheap and poor quality development board together with a small, expensive and high quality development board.

Summary Table

Board ID

#Pins

Pitch

Form factor

LEDs

Antenna

Ant.Socket

Shielded

Dimensions mm

Flash Size in Bytes and (bits)

ESP-01

8

0.1“

2×4 DIL

Yes

Etched-on PCB

No

No

14.3 x 24.8

512KB (4Mb) ××

ESP-02

8

0.1”

2×4 notch

No?

None

Yes

No

14.2 x 14.2

512KB (4Mb) ×

ESP-03

14

2mm

2×7 notch

No

Ceramic

No

No

17.3 x 12.1

512KB (4Mb) ×

ESP-04

14

2mm

2×4 notch

No?

None

No

No

14.7 x 12.1

512KB (4Mb) ×

ESP-05

5

0.1“

1×5 SIL

No

None

Yes

No

14.2 x 14.2

512KB (4Mb) ×

ESP-06

12+GND

misc

4×3 dice

No

None

No

Yes

16.3 x 13.1

512KB (4Mb) ×

ESP-07

16

2mm

2×8 pinhole

Yes

Ceramic

Yes

Yes

21.2 x 16.0

1MB (8Mb) ××

ESP-07S

16

2mm

2×8 pinhole

No

None

Yes

Yes

17.0 x 16.0

4MB (32Mb)

ESP-08

14

2mm

2×7 notch

No

None

No

Yes

17.0 x 16.0

?? (please fill if you know)

ESP-08 New

16

2mm

2×8 notch

No

None

No

Yes

18.0 x 16.0

?? (please fill if you know)

ESP-09

12+GND

misc

4×3 dice

No

None

No

No

10.0 x 10.0

?? (please fill if you know)

ESP-10

5

2mm ??

1×5 notch

No

None

No

No

14.2 x 10.0

512KB (4Mb) *

ESP-11

8

1.27mm

1×8 pinhole

No?

Ceramic

No

No

17.3 x 12.1

512KB (4Mb) *

ESP-12

16

2mm

2×8 notch

Yes

Etched-on PCB

No

Yes

24.0 x 16.0

4MB (32Mb) ??

ESP-12F

22

2mm

2×8 notch

Yes

Etched-on PCB

No

Yes

24.0 x 16.0

4MB (32Mb)

ESP-12E

22

2mm

2×8 notch

Yes

Etched-on PCB

No

Yes

24.0 x 16.0

4MB (32Mb)

ESP-12S

16

2mm

2×8 notch

Yes

Etched-on PCB

No

Yes

24.0 x 16.0

4MB (32Mb)

ESP-13

18

1.5mm

2×9

?

Etched-on PCB

No

Yes

20.0 x 19.9

4MB (32Mb)

ESP-14

22

2mm

2×8 + 6

1

Etched-on PCB

No

Yes

24.3 x 16.2

?? (please fill if you know)

ESP-201

22+4

0.1”

2×11 + 4

2

Etched-on PCB ×××

Yes

No

33.5 x 25.5

512KB (4Mb)

WROOM-02

18

1.5mm

2×9

No

Etched on PCB

No

Yes

20.0 x 18.0

?? (please fill if you know)

WT8266-S1

18

1.5mm

3×6

1

Etched on PCB

No

Yes

15.0 x 18.6

4MB (32Mb)

× New firmwares can only be flashed on boards with at least 1MB (8Mb) flash.×× May be different on different editions of the board.××× Antenna connector is connected by default, to use PCB antenna switch (solder) the 0Ω resistor to the corresponding position.